Adding-machine.



P ATBNTED APR. 21, 1903. s. HARTMANN. ADDING MACHINE. AYPPLIOATION FILED JULY 17, 1902.

2 SHEETS-SHEET 1.

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HUI Hull"? i c f luv 2 H "HIM No. 726,056. 1 v PATENTED APR. 21, 1903.

I S. HARTMANN.

ADDING MACHINE.

APPLICATION FILED JULY 17, 1902.

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Yur. "cams PETUIS co, HHcYo-umu m2 uuuuuuuuu cv UNITED STATES PATENT OFFICE.

SOPHUS HARTMANN, OF BERLIN, GERMANY.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 726,056, dated April 21, 1903.

Application filed July 1'7 1902.

To all whom it may concern:

Be it known that I, SoPHUs HARTMANN, technician, a subject of the Emperor of Germany, residing at lTrebbinerstrasse, Berlin, Germany, have invented newand useful Improvements in Adding-Machines,of which the following is a specification.

My invention relates to adding-machines, and particularly to such machines for summing up units.

For making my invention more clearly understood I will now proceed to describe the same with reference to the accompanying sheet of drawings, in which- Figure 1 is a vertical section of my addingmachine, and Fig. 2 a cross-section thereof on the line A B of Fig. 1, the upper portion being partly broken away. Fig. 3 is a view of the under side of my adding-machine.

In the construction of my adding-machine I use a casing a,which has a circular disk I) rotatably mounted therein on a vertical shaft 0. The said disk bears the numerals 0 to 9 near its edge equidistant from each other and is provided with astop or pinion its under side just below the numeral O. A toothed wheel in on the shaft 0 and a toothed spring-box m of the usual construction provide meansfor rotating the disk Z), the shaft of said springbox having a thumb-piece Z and a pawl and ratchet, as shown. A conically-shaped ring 72, is arranged so as to slide freely on said shaft 0 and is supported by means of a spiral spring, as shown. In the vertical flange of a ring-shaped plate d, extending within said casing a from the wall thereof, and in corresponding openings of the said wall ten slides fare radially guided and are provided with springs e,'which act against cross-pins in said slides, so as to press the said slides outwardly out of the way of the said stop or pin 2'. The slides f,which radially extend out of the casing, according to the division given by the numerals V 0 to 9, have the-form of blades and have a toothed or catch-formed inner end and an oblique downward projection g be hind said catch and are operated as follows: One of said slides beingpushed inward and its end caught by the upwardly spring-pressed Serial No. 115,9l5. (No model.)

ring h, above referred to, the pin 2 stops the rotation of the disk I) by striking against this caughtslide. As thislatterslideisnowstanding in line with the numeral 0, it will be clearly understood that for turning about the disk I) through an arc corresponding to one of the numerals l to 9for instance, to 6it is only necessary to push inwardly the slide which is below said numeral 6, which slide will thereby with its downward projection g act against the yielding ring h, thus pressing same downward and liberating the before-mentioned caught slide. This latter recedes, and the freed pin 7) allows the disk to turn about until the pin strikes the other slide standing before in line with the numeral 6 and now locked in position by the springactuated ring 71). Now it will be clear that by connecting the said disk I) with a suitable counting device 19 by means of a toothed wheel at, fastened on axle c, an adding-machine will be obtained which is operated by simply pressing successively on the slides which stand just in line with the numerals to be summedup. The result thus obtained may be seen within the openings q in the bottom of casing a, which show the numeral- .disksof the said counting device.

Having now described my invention, I claim In an adding-machine, the combination of a casing, a vertical axle in the center thereof, adisk on said axle bearing the numerals O to 9 equidistant from each other, an upwardly-spring-pressed catch-rin g on said axle, ten outwardly-spring-pressed slides radially guided corresponding to the arrangement of the numerals, a tooth at the inner end of each of said slides adapted to be caught by said ring, an oblique projection on each of said slides adapted to force said ring down, a spring-box in gear with said axleand a counting device likewise in gear therewith, substantially as described.

SOPHUS HAET A N,

Witnesses WOLDEMAR HAUPT, HENRY HASPER. 

